Turbocharger control
AssigneeFord Global Technologies, LLC
InventorsAmey Y. Karnik, Julia Helen Buckland
Life of this patent
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Abstract
Various systems and methods for controlling a turbocharger of an engine via a wastegate are described. In one example, actuation of the wastegate is limited when outside a range, the limits of the range varying with boost pressure, turbine inlet pressure, turbine outlet pressure, and atmospheric pressure. In this manner, a tracking error may be reduced when controlling the boost pressure and using the boost pressure to actuate the wastegate in a boost-based wastegate configuration.
Claims19
A method of controlling a turbocharger of an engine via a wastegate, the turbocharger including a turbine, comprising:
- actuating the wastegate with boost pressure generated by the turbocharger;
- and
- limiting adjustment of a wastegate actuator when outside a range, limits of the range varying with boost pressure, turbine inlet pressure, turbine outlet pressure, and atmospheric pressure, the range being increased as a difference between the turbine inlet pressure and the turbine outlet pressure is increased.
A method of controlling a turbocharger of an engine via a wastegate, the wastegate comprising a first port coupled to boost pressure, a second port coupled to atmospheric pressure, and a valve configured to control a flow of exhaust gasses according to a wastegate duty cycle, the turbocharger comprising a turbine, the method comprising:
- actuating the wastegate with boost pressure generated by the turbocharger and with atmospheric pressure;
- and
- limiting adjustment of a wastegate actuator when outside a range, limits of the range varying based on an interrelationship between boost pressure, atmospheric pressure, and a difference between a turbine inlet pressure and a turbine outlet pressure.
A method of controlling a turbocharger of an engine via a wastegate, the turbocharger including a turbine, comprising:
- actuating the wastegate with boost pressure generated by the turbocharger;
- limiting adjustment of a wastegate actuator when outside a range, limits of the range varying with boost pressure, turbine inlet pressure, turbine outlet pressure, and atmospheric pressure;
- determining a target canister pressure of the wastegate via a feedback control system including an integral term;
- and
- calculating a wastegate duty cycle according to the target canister pressure of the wastegate and a difference between the boost pressure and the atmospheric pressure.
Dependencies are inferred from the claim text.